I know, A is the bigger one, but they modified the lines on my car and made a split connection with the same connection at both ends.

I asume A is is the one connected to the top of the distributor because it is bigger and had a filter._________________937 trackday car
Series 2 engine
951S turbo and intercooler
937 DITC
Fast road camshaft
Forge recirculation valve + boost controller